Modified graphite-coated soft particle and method for preparing same, and profile control and water shutoff agent and application thereof

Abstract

The present disclosure relates to the technical field of chemical profile control and water shutoff in oilfields, and discloses a modified graphite-coated soft particle and a method for preparing the same, and a profile control and water shutoff agent and an application thereof. The modified graphite-coated soft particle includes a soft particle and first modified graphite coating a surface of the soft particle. The soft particle includes one or more of a rubber main agent, an antioxidant, an auxiliary antioxidant, a density regulator, and second modified graphite. The first modified graphite and the second modified graphite are the same or different and each are modified graphite with a surface rich in hydroxyl groups and carboxyl groups. The profile control and water shutoff agent can mutually agglomerate after aging for a period upon entering a deep formation zone, and can form effective sealing of a water channeling pathway.